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8-15

LOWR

Lower unit

TIP:

While turning the drive shaft clockwise, push

down on the water pump housing and install

water pump housing.

8. Install the plates m and rubber seal n.

Checking the lower unit for air

leakage

1. Install new gaskets a, the drain screw b

and the flushing screw c.

2. Tighten the drain screw b and flushing

screw c to the specified torque.

3. Install the special service tool d.

4. Apply the specified pressure to check

that the pressure is maintained in the

lower unit for at least 10 seconds.

NOTICE: Do not over pressurize the

lower unit. Otherwise, the oil seals

could be damaged.

5. If the specified pressure cannot be

maintained, check the drive shaft,

propeller shaft, and rubber seal for bends

or damage, and check the shift rod

rubber seal for damage or wear.

Assembling the extension (L-

transom model)

1. Install the bushing a and circlip b.

Drain screw b:

9 N·m (0.9 kgf·m, 6.6 ft·lb)

Flushing screw c:

9 N·m (0.9 kgf·m, 6.6 ft·lb)

Leakage tester d: 90890-06840

Holding pressure:

98.0 kPa (0.98 kgf/cm

, 14.2 psi)

Driver rod L3 c: 90890-06652

Needle bearing attachment d:

90890-06615

Yamaha F4B Service Manual

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